For an audience, musical collection bore a small organ (10)
I believe the answer is:
sweetbread
'a small organ' is the definition.
(sweetbread can mean an animal pancreas)
'for an audience musical collection bore' is the wordplay.
'for an audience' shows a homophone (sound like) (as the word might sound to an audience).
'musical collection' becomes 'suite' (suite of pieces of music).
'bore' becomes 'bread' (I can't justify this - if you can you should give a lot more credence to this answer).
'suite' sounds like 'sweet'.
'sweet'+'bread'='SWEETBREAD'
Can you help me to learn more?
(Other definitions for sweetbread that I've seen before include "Veal offal" , "Pancreas (as food)" , "Thymus gland as food" .)